Lore Sound Does Not Play

In a few of my playthroughs, the later creature lore that comes up after your first encounter with each monster seems to miss one or two. The prompt comes up notifying me that I have acquired new lore, and I can go into the journal to read it, however the sound byte does not play.

I've not tested enough after I've noticed to see if these are the same ones each time or if they're different, but I have noticed it on each playthrough.

Known issues thread:

http://us.battle.net/d3/en/forum/topic/3123365428

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